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Different pushrods are required with a retro-roller cam because the roller lifters are longer. Unlike flat-tappet lifters, pushrods can be reused after a cam change if their ends show no excessive wear, and if they are straight. Simply roll the pushrods on a plate of glass to check for bends. If a flat-tappet cam is used, mark the upper end of the pushrod so that it's easy to check that it's spinning.